200 



Tlic Vlinton Terrace has iKit been fully stiulii'd. Imt is kiidwu to extend 

 from near Hillsdale to the mouth of Brouillefs creek, a distance of 12 

 miles. It is two miles or more in widtli and lies a1 two levels, the lower 

 in the southern lialf about 3(i feet above flood plain or 405 feet A. T. Near 

 Sunmiit Grove it rises by a distinct bench 20 feet hi^Lcher. 



IxJiind 'J'erraces. Between Clinton and Montezuma there is a line of 

 mid-valley terraces divided by cross-depressions into tive islands. They 

 are generally flat-topped with a rather shar]) l)order 20-?)0 feet liiiLih on the 

 river side and a less definite boundary on the liluff side, where they slope 

 gently to a depression lower than the river banks. ( I<Mg. 4. ) The southern- 

 most member of the series is uni(|ue. Its surface presents a confused 



I rJiLO. Clinton Kamc Terraco. 



assemblage of hills and hollows, the highest jxiint rising 4(i feet above 

 flood plain. (Fig. 5.) The surface is imv clean sand which may lie a wind 

 deposit, a conclusion which the topography alone would justify. The saud 

 is underlaid at a depth of 8 to 12 feet by coarse gr.avel. If the topography 

 is determined by gravel deposits they are not alluvial, but can be classified 

 only .-IS a kainc with an eolian veneer. If the island is wholly eolian it is 

 diHi(!Ult to imagine why the wind should be so ellieieiit tbei'e and without 

 effect anywhere else. If it is glacio-fluvial, at core a kame. it means that 

 wlien the ice sheet covered the valley bottom, this jioint was the mouth of 

 a sub-glacial stream. In any case, it is one of the most interesting features 



